From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0235C4332F for ; Fri, 30 Dec 2022 22:00:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235558AbiL3WAB (ORCPT ); Fri, 30 Dec 2022 17:00:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235545AbiL3V76 (ORCPT ); Fri, 30 Dec 2022 16:59:58 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92A481CFF7 for ; Fri, 30 Dec 2022 13:59:57 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2ACAB61C2E for ; Fri, 30 Dec 2022 21:59:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 607C6C433EF; Fri, 30 Dec 2022 21:59:55 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="A9NOIL6G" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1672437593; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=lt8RccqW0EZGdcsp4V34geQbTFJgnELz8Rhyk+5m6GU=; b=A9NOIL6GumZlZuuJSvm/ukN5gXjRMFRJ8nI5syRESrj3smE5vsP1yiFDnW1Bg2c1c8A6tq opxkL3iQhoNYF9aXaoi8j73Iq0Zu5M66COrEPPC/Vbk8/4PsQbZAg00VfABM6cc+HNzYST 2hhOJkykZcSSV4ZgVvuFTKIKzUzxg60= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id fdaa9073 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Fri, 30 Dec 2022 21:59:53 +0000 (UTC) Date: Fri, 30 Dec 2022 22:59:46 +0100 From: "Jason A. Donenfeld" To: pbonzini@redhat.com, ebiggers@kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, ardb@kernel.org, kraxel@redhat.com, hpa@zytor.com, bp@alien8.de, philmd@linaro.org Subject: Re: [PATCH qemu v2] x86: don't let decompressed kernel image clobber setup_data Message-ID: References: <20221230183819.604388-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20221230183819.604388-1-Jason@zx2c4.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 30, 2022 at 07:38:19PM +0100, Jason A. Donenfeld wrote: > The microvm machine has a gross hack where it fiddles with fw_cfg data > after the fact. So this hack is updated to account for this appending, > by reserving some bytes. This is a little derpy. I'll send a v3 in a second to clean this up.